how to repeat a menu switch?

[clairelee0322]

Here's my program, the only problem is that I don't know how to display the menu again after the user used the calcultor. I know it has do with DO WHILE LOOP but I don't know how to put it.. please help me out! Thanks!!

//Claire's Calculator
#include <iostream.h>
#include <math.h>
double pow(double x, double y);
 
 
main()
{
    int choice, choicee;
    const double PI = 3.14159;
    float a, b, c;
    int n, m, i;
    double cy;
    double x, y;
    float x_to_the_y;
    double r;
    int re, q;
 
    do 
    {
        cout << "Which calculation you wish to use?" << '\n';
        cout << "1 - Addition" << '\n';
        cout << "2 - Subtraction" << '\n';
        cout << "3 - Multiplication" << '\n';
        cout << "4 - Division " << '\n';
        cout << "5 - Multiplication by a percent " << '\n';
        cout << "6 - Calculate powers" << '\n';
        cout << "7 - Calculate a circle" << '\n';
        cout << "8 - Calculate an exponential" << '\n';
        cin >> choice;    //get choice from the user
        if ((choice < 1 ) || (choice > 8))
        {
            cout << "Re-enter your choice.\n";
        }
    }    
    while ((choice < 1 ) || (choice > 8));
 
    switch(choice)
    {
    case 1:   // Addition
        cout << "enter 1st number: \n";
        cin >> a;
        cout << "enter 2nd number: \n";
        cin >> b;
        cout << "a + b =" << a + b << '\n';
        break;
    case 2:    //Subtraction
        cout << "Enter first number: \n";
        cin >> a;
        cout << "Enter second number: \n";
        cin >> b;
        cout << "a - b = " << a - b << '\n';
        break;
    case 3:      //Multiplication
        cout << "Enter first number: \n";
        cin >> a;
        cout << "Enter second number: \n";
        cin >> b;
        cout << "a * b = " << a * b << '\n';
        break;
    case 4:    //Division
        do {
            cout << "1 - answer as a decimal\n"; 
            cout << "2 - answer as a fraction\n";
            cout << "3 - answer as a number with a remainder\n";
            cin >> choicee;
        }        
    while ((choicee < 1 ) || (choicee > 3));
 
    switch(choicee)
{
    case 1:  //answer as a decimal
        cout << "Enter first number: \n";
        cin >> a;
        cout << "Enter second number: \n";
        cin >> b;
        cy = a / b;
        cout << "answer = " << cy << '\n';
        break;
    case 2: //answer as a fraction
        i = 0;
        int Denom, Num;
        cout << "Enter first number: \n";
        cin >> Denom;
        cout << "Enter second number: \n";
        cin >> Num;
        n = Denom;
        m = Num;
        for (i = n * m; i > 1; i--)
        {
            if ((n % i == 0) && (m % i == 0))
            {
                n /= i;
                m /= i;
            cout << "answer=" << n << "/" << m << '\n';
            }
        }
    break;
    case 3: //answer as a number with a remainder
        cout << "Enter first number: \n";
        cin >> a;
        cout << "Enter second number: \n";
        cin >> b;
        q = a / b;
        re = (int)a % (int)b;
        cout << "quotient = " << q << '\n';
        cout << "reminder = " << re << '\n';
        break;
    }
    break;
    case 5:    //Multiplication by a percent
        cout << "Enter first number: \n";
        cin >> a;
        cout << "Enter second number:(percentage) \n";
        cin >> b;
        c = a * (b / 100);
        cout << "answer = " << c << '\n';
        break;
    case 6:    //Calculate powers
        double pow(double x, double y);
        cout << "Enter first number: \n";
        cin >> x;
        cout << "Enter the power: \n";
        cin >> y;    
        x_to_the_y = pow(x, y);
        cout << "answer = " << x_to_the_y << '\n';
        break;    
    case 7:   //Calculate a circle
        cout << "Please enter r = \n";
        cin >> r;
        cout << "The area is " << PI * r * r << '\n';
        break;
    case 8:    // Calculate an exponential
        cout << "Enter first number: \n";
        cin >> a;
        double pow(double x, double y);
        cout << "Enter second number: \n";
        cin >> x;
        cout << "Enter the power: \n";
        cin >> y;    
        x_to_the_y = pow(x, y);
        cout << "answer = " << a * x_to_the_y << '\n';
        break;
    }
    return 0;
 
}

[Ganon11]

You are correct, it has to do with a do...while loop. What will be the end condition? What do you want to loop? Answer these questions and you will be 95% of the way to your answer.

[clairelee0322]

You are correct, it has to do with a do...while loop. What will be the end condition? What do you want to loop? Answer these questions and you will be 95% of the way to your answer.

mm.. I want it to display its menu again after the user used the calculator once.....The end condition? what do you mean? When the case ends? ??

[Ganon11]

Exactly. When do you want this loop to stop e.g. the menu to stop displaying? Do you want it stop when the user enters a certain character (N)? Do you want it to stop when the result they got is larger than some number? Do you want it to randomly stop?

[clairelee0322]

Exactly. When do you want this loop to stop e.g. the menu to stop displaying? Do you want it stop when the user enters a certain character (N)? Do you want it to stop when the result they got is larger than some number? Do you want it to randomly stop?

Thanks alot! Ganon11!! :D ^^

#
        break;
#
    case 8:    // Calculate an exponential
#
        cout << "Enter first number: \n";
#
        cin >> a;
#
        double pow(double x, double y);
#
        cout << "Enter second number: \n";
#
        cin >> x;
#
        cout << "Enter the power: \n";
#
        cin >> y;   
#
        x_to_the_y = pow(x, y);
#
        cout << "answer = " << a * x_to_the_y << '\n';
#
        continue;
#
    }
#
    return 0;
 
 
 
 
 If I change all the break; to continue; , the program will continue forever right??
 
 
 
 
or the other way? I am not sure althoughI looked up for some resources
 
#
 
#
    do
#
    {
#
        cout << "Which calculation you wish to use?" << '\n';
#
        cout << "1 - Addition" << '\n';
#
        cout << "2 - Subtraction" << '\n';
#
        cout << "3 - Multiplication" << '\n';
#
        cout << "4 - Division " << '\n';
#
        cout << "5 - Multiplication by a percent " << '\n';
#
        cout << "6 - Calculate powers" << '\n';
#
        cout << "7 - Calculate a circle" << '\n';
#
        cout << "8 - Calculate an exponential" << '\n';
#
        cin >> choice;    //get choice from the user
#
        if ((choice < 1 ) || (choice > 8))
#
        {
#
            cout << "Re-enter your choice.\n";
#
        }
#
continue;
    }   
#
    while ((choice < 1 ) || (choice > 8));

[sicarie]

clairelee0322-

Please have a look at this, it explains how to use code tags when posting. Thanks